Just letting you know that Chrome is going to block ports 989 (ftps-data) and port 990 (ftps) in version 93. This is to prevent cross-protocol attacks. See https://github.com/whatwg/fetch/pull/1250 for background. I think it would be good for users if WebKit also blocked these ports. There is an issue at https://bugs.webkit.org/show_bug.cgi?id=226971. Thanks, Adam Rice